﻿//-----------------------------------------------------------------------
// <copyright file="ConfigurationLoader.cs" company="OOHM PROCESSAMENTO DE DADOS LTDA.">
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//-----------------------------------------------------------------------
namespace AbstractSaaSTemplate.Application.Configuration{    using System;
    using System.Configuration;
    using System.Globalization;
    using System.IO;
    using System.Reflection;
    using System.Text;
    using AbstractSaaSTemplate.Application.Localization;

    /// <summary>
    /// Provides the very basic configuration info that can be used
    /// by OOHM.Framework.Configuration.Configurator to be initialized
    /// and start managing the Configuration.
    /// </summary>
    public static class ConfigurationLoader
    {
        /// <summary>
        /// Gets the ApplicationId from the configuration file, performing all
        /// required validation and checks to the app/web.config file appSettings entry.
        /// </summary>
        /// <returns>Returns a Guid that represents the Application Id.</returns>
        [System.Diagnostics.CodeAnalysis.SuppressMessage(
            "Microsoft.Design",
            "CA1024:UsePropertiesWhereAppropriate",
            Justification = "We shouldn't raise exceptioions in properties.")]
        public static Guid GetApplicationId()
        {
            var appId = ConfigurationManager.AppSettings[ConfigurationKeys.ApplicationId];
            if (string.IsNullOrWhiteSpace(appId))
            {
                throw new ConfigurationErrorsException(string.Format(
                    CultureInfo.CurrentUICulture,
                    Messages.TheConfigKeyXIsMissing,
                    ConfigurationKeys.ApplicationId));
            }

            var parsedId = Guid.Empty;
            if (!Guid.TryParse(appId, out parsedId))
            {
                throw new ConfigurationErrorsException(string.Format(
                    CultureInfo.CurrentUICulture,
                    Messages.TheConfigKeyXIsMissing,
                    ConfigurationKeys.ApplicationId));
            }

            return parsedId;
        }
        
        /// <summary>
        /// Gets the ConfigurationFilePath from the configuration file, performing all
        /// required validation and checks to the app/web.config file appSettings entry.
        /// </summary>
        /// <returns>Returns a Guid that represents the Application Id.</returns>
        [System.Diagnostics.CodeAnalysis.SuppressMessage(
            "Microsoft.Design",
            "CA1024:UsePropertiesWhereAppropriate",
            Justification = "We shouldn't raise exceptioions in properties.")]
        public static string GetConfigurationFilePath()
        {
            var configFilePath = ConfigurationManager.AppSettings[ConfigurationKeys.ConfigurationFilePath];
            if (string.IsNullOrWhiteSpace(configFilePath))
            {
                throw new ConfigurationErrorsException(string.Format(
                    CultureInfo.CurrentUICulture,
                    Messages.TheConfigKeyXIsMissing,
                    ConfigurationKeys.ConfigurationFilePath));
            }

            if (configFilePath.StartsWith("/", StringComparison.OrdinalIgnoreCase))
            {
                var configPathFrags = configFilePath.Split(new[] { '/' }, StringSplitOptions.RemoveEmptyEntries);

                var basePath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().GetName().CodeBase);
                if (!string.IsNullOrWhiteSpace(basePath))
                {
                    basePath = basePath.Replace("/", "\\");
                    var basePathFrags = basePath.Split(new[] { '\\' }, StringSplitOptions.RemoveEmptyEntries);

                    var basePathFragsToAdd = basePathFrags.Length;
                    foreach (var configPathFrag in configPathFrags)
                    {
                        if (configPathFrag != "..")
                        {
                            break;
                        }

                        basePathFragsToAdd--;
                    }

                    var finalPath = new StringBuilder();
                    for (var i = 0; i < basePathFragsToAdd; i++)
                    {
                        var fragToAdd = basePathFrags[i];
                        finalPath.Append(fragToAdd);
                        finalPath.Append("\\");
                    }

                    basePath = finalPath.ToString().TrimEnd('\\');
                    finalPath = new StringBuilder(basePath);

                    foreach (var configPathFrag in configPathFrags)
                    {
                        if (configPathFrag == "..")
                        {
                            continue;
                        }

                        finalPath.Append("\\");
                        finalPath.Append(configPathFrag);
                    }

                    configFilePath = finalPath
                        .ToString()
                        .Replace("file:\\", string.Empty);
                }
            }

            return configFilePath;
        }
    }
}


